If a neurotransmitter fails to bind to receptors on the motor end plate, which of the following events would be the first one to fail to occur?
A) Ligand-gated sodium channels would not open.
B) Calcium ions would not enter the axon terminal.
C) Sodium ions would not enter the postsynaptic neuron.
D) A postsynaptic action potential would not be triggered.
Answer: A
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A muscle directly involved in causing a segment to move is called what?
A. agonist B. antagonist C. neutralizer D. stabilizer
Using the figure below, identify the labeled part.
1) Label A: ______________________________
2) Label B: ______________________________
3) Label C: ______________________________
4) Label D: ______________________________
5) Label E: ______________________________
6) Label F: ______________________________
7) Label G: ______________________________
8) Label H: ______________________________
9) Label I: ______________________________
10) Label J: ______________________________
Blood returning from the vena cava:
a. enters the right atrium. b. enters the left atrium. c. is poorly oxygenated. d. both (a) and (c) above. e. both (b) and (c) above.
An individual hydrogen bond in a sample of water would be described as:
A. strong and intramolecular. B. weak and intramolecular. C. weak and intermolecular. D. strong and intermolecular.